JP7410418B2 - Indoor unit and air conditioner - Google Patents

Description

The present disclosure relates to an indoor unit and an air conditioner.

Conventionally, in an indoor unit, a connection part between a first refrigerant pipe made of aluminum or an aluminum alloy and a second refrigerant pipe made of copper or a copper alloy is connected to a falling part of the first refrigerant pipe. There is one in which anti-corrosion treatment is performed by covering the entire first refrigerant pipe with a heat insulating material (see, for example, Japanese Patent Laid-Open No. 2013-155892 (Patent Document 1)).

Japanese Patent Application Publication No. 2013-155892

In the above indoor unit, since the dissimilar metals of the first and second refrigerant pipes are connected outside the casing, condensation is likely to occur on the refrigerant pipes when exposed to indoor air. provided. Since the inside of this dew protection cylinder is difficult to dry, there is a problem in that the connecting portion of the first and second refrigerant pipes remains wet for a long time, causing electrolytic corrosion.

The present disclosure proposes an indoor unit that can suppress the occurrence of electrolytic corrosion in refrigerant piping, and an air conditioner equipped with the indoor unit.

The indoor unit of the present disclosure is
casing and
a heat exchanger housed in the casing;
A connection pipe connected to the heat exchanger and through which the refrigerant flows,
The above connection piping is
a first refrigerant pipe connected to the heat exchanger at one end and formed of a first metal;
a second refrigerant pipe formed of a second metal that is potentially nobler than the first metal of the first refrigerant pipe;
One end of the second refrigerant pipe is connected to the other end of the first refrigerant pipe within the casing.

According to the present disclosure, since the connection point between the first refrigerant pipe and the second refrigerant pipe is located in the casing that is not covered with a dew prevention cylinder, it is possible to suppress the occurrence of dew condensation at the connection point, and the refrigerant It is possible to suppress the occurrence of electrolytic corrosion in piping.

Moreover, in the indoor unit according to one aspect of the present disclosure,
The other end of the first refrigerant pipe is located above one end of the second refrigerant pipe.

According to the present disclosure, even if condensation occurs in the second refrigerant pipe, the other end of the first refrigerant pipe is located above one end of the second refrigerant pipe, so that the condensed water will not be transmitted to the first refrigerant pipe. There is no electrolytic corrosion, and the occurrence of electrolytic corrosion can be reliably suppressed.

Moreover, in the indoor unit according to one aspect of the present disclosure,
comprising a cylindrical member that covers a part of the connecting pipe but does not cover other parts of the connecting pipe,
In the other portion, one end of the second refrigerant pipe is connected to the other end of the first refrigerant pipe.

According to the present disclosure, since the connecting portion where one end of the second refrigerant pipe and the other end of the first refrigerant pipe are connected is not covered with the cylindrical member, electrolytic corrosion due to condensed water accumulated in the cylindrical member is prevented. Risk can be reduced.

Moreover, in the indoor unit according to one aspect of the present disclosure,
The second refrigerant pipe has a bent portion that is bent so as to protrude downward,
The bent portion is located within the casing.

According to the present disclosure, by arranging the bent part that is bent so as to project downward in the second refrigerant pipe in the casing, the condensed water generated in the second refrigerant pipe drips at the bent part, so that the first Condensed water is not transmitted to the refrigerant piping from the second refrigerant piping side, and the occurrence of electrolytic corrosion can be reliably suppressed.

Moreover, in the indoor unit according to one aspect of the present disclosure,
The connection pipe includes a first connection pipe and a second connection pipe,
The first connection pipe is
a 1-1 refrigerant pipe whose one end is connected to the heat exchanger and is made of the first metal;
The second refrigerant pipe is formed of the second metal which is nobler in potential than the first metal of the refrigerant pipe No. 1-1, and has one end connected to the other end of the refrigerant pipe No. 1-1. 1 refrigerant piping,
The second connection pipe is
a 1-2 refrigerant pipe, one end of which is connected to the heat exchanger, and which is made of the first metal;
The second refrigerant pipe is formed of the second metal which is potentially nobler than the first metal of the first refrigerant pipe, and has one end connected to the other end of the first refrigerant pipe. 2 refrigerant piping (322).

According to the present disclosure, it is possible to suppress the occurrence of dew condensation in the refrigerant pipe in both the first connection pipe and the second connection pipe, and it is possible to suppress the occurrence of electrolytic corrosion.

Moreover, in the indoor unit according to one aspect of the present disclosure,
The first connecting pipe is a liquid pipe, while the second connecting pipe is a gas pipe,
In the casing, the other end of the 1-1 refrigerant pipe is arranged above one end of the 2-2 refrigerant pipe.
Here, the liquid pipe is the refrigerant pipe connected to the inlet of the evaporator (heat exchanger during cooling operation or dehumidification operation), and the gas pipe is the refrigerant pipe connected to the outlet of the evaporator. be.

According to the present disclosure, since the other end of the 1-1 refrigerant pipe on the liquid pipe side is arranged above one end of the 2-2 refrigerant pipe on the gas pipe side, the 2-2 refrigerant pipe has a large amount of dew condensation. Since the refrigerant pipe is arranged below, it is possible to suppress the occurrence of electrolytic corrosion in the upper No. 1-1 refrigerant pipe.

Moreover, in the indoor unit according to one aspect of the present disclosure,
In a top view of the casing, the 1-1 refrigerant pipe is arranged at a position that does not overlap with the 2-2 refrigerant pipe.

According to the present disclosure, since the 1-1 refrigerant pipe and the 2-2 refrigerant pipe do not overlap in a top view, the condensed water dripping from the 2-2 refrigerant pipe does not hit the 1-1 refrigerant pipe. Therefore, electrolytic corrosion of the 1-1 refrigerant pipe can be suppressed.

Moreover, in the indoor unit according to one aspect of the present disclosure,
In a top view of the casing, the bent portion is disposed at a position that does not overlap with electrical components within the casing.

According to the present disclosure, since the bent portion of the second refrigerant pipe and the electrical component do not overlap in a top view, it is possible to prevent condensed water dripping from the second refrigerant pipe from hitting the electrical component.

Moreover, in the indoor unit according to one aspect of the present disclosure,
On a drain pan provided in the casing, one end of the second refrigerant pipe is connected to the other end of the first refrigerant pipe.

According to the present disclosure, condensed water dripping from the connecting portion where one end of the second refrigerant pipe and the other end of the first refrigerant pipe are connected can be received by the drain pan and drained together with the drain water.

Further, the air conditioner of the present disclosure includes:
Equipped with one of the above indoor units.

FIG. 1 is a refrigerant circuit diagram of an air conditioner including an indoor unit according to a first embodiment of the present disclosure. It is a perspective view of the indoor unit of the air conditioner of the said 1st Embodiment. It is a front view of the indoor unit of the air conditioner of the said 1st Embodiment. It is a back perspective view of the indoor unit of the air conditioner of the said 1st Embodiment. 4 is a sectional view taken along line VV in FIG. 3. FIG. It is a figure which looked at the indoor heat exchanger of the indoor unit of the said 1st Embodiment, the connection piping for liquid refrigerant, and the connection piping for gas refrigerant from the front side. FIG. 2 is a schematic diagram of the main parts of the indoor heat exchanger of the indoor unit of the first embodiment, viewed from the front side. FIG. 2 is a schematic diagram of the main parts of the indoor heat exchanger of the indoor unit of the first embodiment, viewed from the front side. FIG. 2 is a side view of the indoor heat exchanger, liquid refrigerant connection pipes, and gas refrigerant connection pipes of the indoor unit of the first embodiment, viewed from the right side. FIG. 2 is a schematic diagram of main parts of an indoor unit according to a second embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of main parts of an indoor unit according to a third embodiment of the present disclosure, viewed from the front side.

Hereinafter, the indoor unit and air conditioner of the present disclosure will be described in detail with reference to illustrated embodiments. Note that common parts in each figure are given the same reference numerals, and redundant explanation will be omitted. In addition, the up, down, left, and right directions in the description correspond to the up, down, left, and right directions when the indoor unit is installed indoors.

[First embodiment]
FIG. 1 shows a refrigerant circuit RC included in an air conditioner including an indoor unit 1 according to a first embodiment of the present disclosure. The air conditioner of the first embodiment includes an indoor unit 1 and an outdoor unit 2 connected to the indoor unit 1 via a refrigerant circuit RC. The above-mentioned air conditioner is a pair-type air conditioner in which an indoor unit 1 and an outdoor unit 2 are one-to-one.

The refrigerant circuit RC includes a compressor 11 , a four-way switching valve 12 , an outdoor heat exchanger 13 , an electric expansion valve 14 , an indoor heat exchanger 15 , and an accumulator 16 . As the compressor 11 is driven, refrigerant (for example, HFC refrigerant such as R410A and R32) circulates through the refrigerant circuit RC. The indoor heat exchanger 15 is an example of a heat exchanger.

More specifically, one end of a four-way selector valve 12 is connected to the discharge side of the compressor 11. One end of an outdoor heat exchanger 13 is connected to the other end of the four-way switching valve 12 . One end of an electric expansion valve 14 is connected to the other end of the outdoor heat exchanger 13 . One end of an indoor heat exchanger 15 is connected to the other end of the electric expansion valve 14 via a closing valve V1 and a connecting pipe L1. One end of an accumulator 16 is connected to the other end of the indoor heat exchanger 15 via a connecting pipe L2, a closing valve V2, and a four-way switching valve 12. The other end of the accumulator 16 is connected to the suction side portion of the compressor 11.

Further, the indoor heat exchanger 15 and the indoor fan 18 are mounted on the indoor unit 1. This indoor fan 18 is, for example, a cross flow fan, and sucks indoor air through the indoor heat exchanger 15.

Further, the compressor 11 , the four-way switching valve 12 , the outdoor heat exchanger 13 , the electric expansion valve 14 , the accumulator 16 and the outdoor fan 17 are mounted on the outdoor unit 2 .

During cooling operation and dehumidification operation, the air conditioner switches the four-way switching valve 12 to the switching position indicated by the solid line to start the compressor 11, while during heating operation, the four-way switching valve 12 is switched to the switching position indicated by the dotted line. and starts the compressor 11. Note that the direction of the solid arrow in FIG. 1 indicates the direction in which the refrigerant flows during cooling operation and dehumidification operation. Further, the direction of the dotted arrow in FIG. 1 indicates the direction in which the refrigerant flows during heating operation.

FIG. 2 is a diagram of the indoor unit 1 viewed diagonally from above, and FIG. 3 is a diagram of the indoor unit 1 viewed from the front side.

As shown in FIGS. 2 and 3, the indoor unit 1 includes a casing 21, and an indoor heat exchanger 15 (shown in FIG. 1), an indoor fan 18 (shown in FIG. 1), etc. are housed in the casing 21. There is.

A suction port 22 for sucking indoor air is provided in the upper part of the casing 21. When the indoor fan 18 is driven, indoor air enters the casing 21 from the suction port 22 and heads toward the indoor fan 18 (cross flow fan). At this time, a filter (not shown) is attached to the suction port 22 to prevent dust and the like from entering the casing 21 together with the indoor air.

At the bottom of the casing 21, an air outlet 23 is provided that blows out air from the indoor fan 18 (indoor air that has exchanged heat with the indoor heat exchanger 15). A horizontal flap 24 is rotatably attached to the peripheral edge of the air outlet 23.

When a cooling operation or the like starts, the horizontal flap 24 shifts from a stopped position in which it closes the air outlet 23 to an operating position in which it opens the air outlet 23, and changes the vertical direction of the air blown out from the air outlet 23. Adjust.

4 is a rear perspective view of the indoor unit 1, and FIG. 5 is a sectional view taken along the line VV in FIG. 3. In FIG. 5, 28 is an electrical component section.

As shown in FIGS. 4 and 5, the casing 21 of the indoor unit 1 includes a bottom frame 25, a front grill 26 attached to the bottom frame 25, and having a substantially rectangular opening (not shown) on the front surface. The front panel 27 is attached to cover the opening of the front grill 26. The front grill 26 surrounds the front, top, bottom, and both sides of the bottom frame 25. The rear side of the bottom frame 25 is attached to an indoor wall via a mounting plate (not shown).

A first space 21a surrounded by a bottom frame 25, a front grill 26, and a front panel 27 is formed inside the casing 21. The first space 21a is the main area within the casing 21. The first space 21a accommodates an in-machine part of the liquid refrigerant connection pipe 31 and an in-machine part of the gas refrigerant connection pipe 32.

Further, a second space 30a (piping upright portion) is formed on the right side of the bottom frame 25 along the vertical direction. A third space 30b connected to the lower end of the second space 30a is formed on the rear surface and lower part of the bottom frame 25 along the left-right direction.

The liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 are arranged to extend from the indoor heat exchanger 15 in the first space 21a along the second space 30a and the third space 30b. A vertical portion of the liquid refrigerant connection pipe 31 and a vertical portion of the gas refrigerant connection pipe 32 are accommodated in the second space 30a. A horizontal portion of the liquid refrigerant connection pipe 31 and a horizontal portion of the gas refrigerant connection pipe 32 are accommodated in the third space 30b. The liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 are led out of the casing 21 from above a drain pan 29 (shown in FIGS. 7 and 8) provided on the bottom frame 25.

The second space 30a and the third space 30b are not inside the casing 21 but outside the rear of the bottom frame 25. That is, the second space 30a and the third space 30b are located outside the casing 21.

FIG. 6 is a diagram of the indoor heat exchanger 15, the liquid refrigerant connection pipe 31, and the gas refrigerant connection pipe 32 viewed from the front side.

As shown in FIG. 6, the indoor heat exchanger 15 includes a heat exchange section 151 and a plurality of heat transfer tubes 152 passing through the heat exchange section 151 in the left-right direction. This heat exchange section 151 and each heat exchanger tube 152 are each formed of aluminum or an aluminum alloy.

In addition, the indoor unit 1 includes a liquid refrigerant connection pipe 31 and a gas refrigerant connection pipe 32 that are fluidly connected to the heat transfer tubes 152 of the indoor heat exchanger 15. The liquid refrigerant connection pipe 31 is an example of a first connection pipe, and constitutes a part of the communication pipe L1 (shown in FIG. 1). The gas refrigerant connection pipe 32 is an example of a second connection pipe, and constitutes a part of the communication pipe L2 (shown in FIG. 1). The liquid refrigerant connection pipe 31 guides the liquid refrigerant from the electric expansion valve 14 to the indoor heat exchanger 15 during cooling operation and dehumidification operation. On the other hand, the gas refrigerant connection pipe 32 guides the gas refrigerant from the indoor heat exchanger 15 to the compressor 11 during cooling operation and dehumidification operation.

7 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side, FIG. 8 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side, and FIG. 9 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side. It is a side view of the exchanger 15, the liquid refrigerant connection pipe 31, and the gas refrigerant connection pipe 32, viewed from the right side. In FIGS. 7 and 8, 29 is a drain pan disposed within the casing 21 and below the indoor heat exchanger 15. Moreover, in FIGS. 8 and 9, the cylindrical member 61 is omitted.

<Configuration of liquid refrigerant connection pipe 31>
The liquid refrigerant connection pipe 31 includes a first liquid refrigerant pipe 311 made of aluminum or an aluminum alloy, a second liquid refrigerant pipe 312 made of copper or a copper alloy, and a first liquid refrigerant pipe 311 and a second liquid refrigerant pipe 311 made of aluminum or an aluminum alloy. A connection part 313 formed of copper or copper alloy is provided to connect the refrigerant pipe 312. The first liquid refrigerant pipe 311 is an example of a first refrigerant pipe and a 1-1 refrigerant pipe, and the second liquid refrigerant pipe 312 is an example of a second refrigerant pipe and a 2-1 refrigerant pipe. Aluminum and aluminum alloy are each examples of first metals. Copper and copper alloy are each examples of second metals.

One end of the second liquid refrigerant pipe 312 is connected to one end of the connecting portion 313 by copper-copper bonding. The other end of the connecting portion 313 is connected to the heat transfer tube 152 of the indoor heat exchanger 15 via a first liquid refrigerant pipe 311 made of aluminum or aluminum alloy.

A liquid refrigerant flare union 41 is fixed to the other end of the second liquid refrigerant pipe 312 by brazing.

<Configuration of gas refrigerant connection pipe 32>
The gas refrigerant connection pipe 32 is configured similarly to the liquid refrigerant connection pipe 31, and includes a first gas refrigerant pipe 321 made of aluminum or aluminum alloy, and a second gas refrigerant pipe 322 made of copper or copper alloy. , a connecting portion 323 formed of copper or copper alloy that connects the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322. The first gas refrigerant pipe 321 is an example of a first refrigerant pipe and a 1-2 refrigerant pipe. The second gas refrigerant pipe 322 is an example of a second refrigerant pipe and a 2-2 refrigerant pipe.

One end of the first gas refrigerant pipe 321 is connected to one end of the connecting portion 323 by copper-copper bonding. The other end of the connecting portion 323 is connected to the heat transfer tube 152 of the indoor heat exchanger 15 via a first gas refrigerant pipe 321 made of aluminum or aluminum alloy.

A gas refrigerant flare union 42 is fixed to the other end of the first gas refrigerant pipe 321 by brazing.

<Configuration of the second liquid refrigerant pipe 312 on the first liquid refrigerant pipe 311 side>
As shown in FIG. 7, the second liquid refrigerant pipe 312 of the liquid refrigerant connection pipe 31 has a first portion 312a extending substantially vertically. The above-mentioned substantially vertical direction means a vertical direction or a direction inclined at an angle of, for example, 20 degrees or less with respect to the vertical direction. Further, the second liquid refrigerant pipe 312 has a second portion 312b closer to the liquid refrigerant flare union 41 than the first portion 312a. The second portion 312b is connected to the lower end of the first portion 312a (the end on the second liquid refrigerant pipe 312 side) and is bent from the lower end toward the liquid refrigerant flare union 41 side.

Further, the second liquid refrigerant pipe 312 has a third portion 312c closer to the liquid refrigerant flare union 41 than the second portion 312b. This third portion 312c extends substantially horizontally. The above-mentioned substantially horizontal direction means the horizontal direction or a direction inclined at an angle of, for example, 20 degrees or less with respect to the horizontal direction.

<Configuration of the second liquid refrigerant pipe 312 on the indoor heat exchanger 15 side>
The second liquid refrigerant pipe 312 has a fourth portion 312d closer to the indoor heat exchanger 15 than the first portion 312a. The fourth portion 312d is bent downward in a U-turn from the upper end of the first portion 312a.

Further, the second liquid refrigerant pipe 312 has a fifth portion 312e closer to the indoor heat exchanger 15 than the fourth portion 312d. The fifth portion 312e is an example of a bent portion. The fifth portion 312e is bent upward in a U-turn from the end of the fourth portion 312d. An end of the fifth portion 312e on the indoor heat exchanger 15 side is connected to one end of a connecting portion 313 made of copper or a copper alloy.

A first liquid refrigerant pipe 311 made of aluminum or an aluminum alloy is fixed to the other end of this connection portion 313 (the end on the indoor heat exchanger 15 side) by brazing. The other end of the connection section 313 is connected to the heat exchange section 151 via the first liquid refrigerant pipe 311.

In this first embodiment, the gas refrigerant connection pipe 32 also has the same configuration as the liquid refrigerant connection pipe 31.

The cylindrical member 61 covers from the fourth portion 312d of the second liquid refrigerant pipe 312 to the vicinity of the liquid refrigerant flare union 41. The cylindrical member 61 is made of a heat insulating material (for example, foamed polyester).

Although not shown, most of the gas refrigerant connection pipe 32 is also inserted into the cylindrical member 61, similar to the liquid refrigerant connection pipe 31. Therefore, the inner diameter of the cylindrical member 61 is set to be larger than the sum of the outer diameter of the liquid refrigerant connection pipe 31 and the outer diameter of the gas refrigerant connection pipe 32.

Further, a joint between the connecting portion 313 and the first liquid refrigerant pipe 311 is covered with a waterproof tube 51. The waterproof tube 51 is formed by heating and shrinking a tube made of a waterproof material (eg, vinyl chloride, silicone rubber, fluorine-based polymer, etc.).

Moreover, within the casing 21, the liquid refrigerant connection pipe 31 is arranged above the gas refrigerant connection pipe 32.

In the indoor unit 1 having the above configuration, as shown in FIGS. 7, 8, and 9, the first metal (aluminum or aluminum alloy in this embodiment) of the first liquid refrigerant pipe 311 (first refrigerant pipe) One end of the second liquid refrigerant pipe 312 (second refrigerant pipe) formed of a potentially noble second metal (copper or copper alloy in this embodiment) and the other end of the first liquid refrigerant pipe 311 are connected to each other. They are connected within the casing 21. Further, a second metal (in this embodiment, copper or a copper alloy) that is potentially nobler than the first metal (in this embodiment, aluminum or aluminum alloy) of the first gas refrigerant pipe 321 (first refrigerant pipe) is used. ) is connected to one end of the second gas refrigerant pipe 322 (second refrigerant pipe) and the other end of the first liquid refrigerant pipe 311 within the casing 21. As a result, the connection point between aluminum (or aluminum alloy) and copper (or copper alloy) is located inside the casing 21 which is not covered with a dew-proof cylinder, so it is possible to suppress the occurrence of dew condensation at the connection point. , the occurrence of electrolytic corrosion in refrigerant piping can be suppressed.

In addition, in this embodiment, the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312 are connected via the connection part 313, but the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312 are connected without a connection part. may be connected directly. Furthermore, although the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322 are connected via the connecting part 323, it is possible to directly connect the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322 without a connecting part. Good too.

Furthermore, in the indoor unit 1, even if condensation occurs in the second liquid refrigerant pipe 312, the other end of the first liquid refrigerant pipe 311 is located above one end of the second liquid refrigerant pipe 312, so that the first Since the condensed water is not transmitted to the liquid refrigerant pipe 311 and drips at the fifth portion 312e (bent portion), occurrence of electrolytic corrosion can be reliably suppressed (the same applies to the gas refrigerant connection pipe 32).

In addition, since the connecting portion 313 (other portion) where one end of the second liquid refrigerant pipe 312 and the other end of the first liquid refrigerant pipe 311 are connected is not covered with the cylindrical member 61, the cylindrical member 61 may accumulate. The risk of electrolytic corrosion caused by condensed water can be reduced (the same applies to the gas refrigerant connection pipe 32).

In addition, by arranging the fifth portion 312e (bent portion) of the second liquid refrigerant pipe 312 that is bent so as to protrude downward in the casing 21, the condensed water generated in the second liquid refrigerant pipe 312 is removed from the bent portion. Since the condensed water is not transmitted to the first liquid refrigerant pipe 311 from the second liquid refrigerant pipe 312 side, the occurrence of electrolytic corrosion can be reliably suppressed (the same applies to the gas refrigerant connection pipe 32).

In addition, in the indoor unit 1, it is possible to suppress the occurrence of condensation in the refrigerant pipes in both the liquid refrigerant connection pipe 31 (first connection pipe) and the gas refrigerant connection pipe 32 (second connection pipe), and the It can suppress the occurrence of eclipse.

Further, the other end of the first liquid refrigerant pipe 311 (1-1 refrigerant pipe) on the liquid pipe side is arranged above one end of the second gas refrigerant pipe 322 (2-2 refrigerant pipe) on the gas pipe side. Therefore, the second gas refrigerant pipe 322 with a large amount of dew condensation is arranged below, and the occurrence of electrolytic corrosion in the first liquid refrigerant pipe 311 above can be suppressed.

In addition, in the top view of the casing 21, the first liquid refrigerant pipe 311 (1-1 refrigerant pipe) does not overlap with the first gas refrigerant pipe 321 (2-2 refrigerant pipe), so the first gas refrigerant pipe The condensed water dripping from the first liquid refrigerant pipe 311 can be prevented from hitting the first liquid refrigerant pipe 311, and electrolytic corrosion of the first liquid refrigerant pipe 311 can be suppressed.

In addition, in a top view of the casing 21, the fifth portion 312e (bent portion) of the second liquid refrigerant pipe 312 does not overlap with the electrical components (for example, the electrical component part 28) in the casing 21, so the second liquid refrigerant pipe It is possible to prevent the condensed water dripping from 312 from hitting the electrical parts.

Moreover, on the drain pan 29 provided in the casing 21, one end of the second liquid refrigerant pipe 312 is connected to the other end of the first liquid refrigerant pipe 311 via the connection part 313, so that dripping from the connection part 313 The condensed water can be caught by the drain pan 29 and drained together with the drain water.

[Second embodiment]
FIG. 10 is a schematic diagram of the main parts of the indoor unit 1 according to the second embodiment of the present disclosure, viewed from the front side. The indoor unit 1 of the second embodiment has the same configuration as the indoor unit 1 of the first embodiment except for the waterproof tube 51.

As shown in FIG. 10, in the indoor unit 1 of the second embodiment, the waterproof tube 51 covers from the joint between the connecting portion 313 and the first liquid refrigerant pipe 311 to the fourth portion 312d. Thereby, generation of dew condensation water from the second liquid refrigerant pipe 312 formed of copper or copper alloy can be suppressed.

The indoor unit 1 of the second embodiment has the same effects as the indoor unit 1 of the first embodiment.

[Third embodiment]
FIG. 11 is a schematic diagram of main parts of the indoor unit 1 according to the third embodiment of the present disclosure, viewed from the front side. The indoor unit 1 of this third embodiment has the same configuration as the indoor unit 1 of the first embodiment except for the third refrigerant pipe 314.

As shown in FIG. 11, in the indoor unit 1 of the third embodiment, the connecting portion 313 and the first liquid refrigerant pipe 311 are connected via the third refrigerant pipe 314 made of stainless steel. As a result, the first liquid refrigerant pipe 311 made of aluminum or aluminum alloy and the third refrigerant pipe 314 made of stainless steel are brazed, and the connection part 313 made of copper or copper alloy and the third refrigerant pipe made of stainless steel are brazed. Brazing with the refrigerant pipe 314 is easier than joining aluminum and copper.

In the air conditioners of the first to third embodiments described above, one indoor unit 1 is connected to one outdoor unit 2, but a plurality of indoor units 1 may be connected. In other words, although the above air conditioners are of a pair type, they may be of a multi-type.

In the first to third embodiments described above, the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 as the first refrigerant pipe are made of aluminum or an aluminum alloy, but they are made of a metal other than aluminum or an aluminum alloy. may be formed.

In the first to third embodiments described above, the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322 as the second refrigerant pipe are made of copper or a copper alloy, but they are made of a metal other than copper or a copper alloy. It is sufficient that the first refrigerant pipe is made of a metal that is noble in potential with respect to the metal of the first refrigerant pipe.

In the first to third embodiments described above, the indoor heat exchanger 15 and the first liquid refrigerant pipe 311 were connected in the liquid refrigerant connection pipe 31, but the connection between the indoor heat exchanger 15 and the first liquid refrigerant pipe 311 was A plurality of first liquid refrigerant pipes 311 may be connected to the indoor heat exchanger 15 with a flow divider interposed therebetween (the same applies to the gas refrigerant connection pipe 32).

Although specific embodiments of the present disclosure have been described, the present disclosure is not limited to the first to third embodiments described above, and can be implemented with various changes within the scope of the present disclosure.

1... Indoor unit 15... Indoor heat exchanger 21... Casing 21a... First space 22... Suction port 23... Outlet 24... Horizontal flap 25... Bottom frame 26... Front grill 27... Front panel 28... Electrical component part 29... Drain pan 30a...Second space 30b...Third space 31...Liquid refrigerant connection pipe (first connection pipe)
32...Connection pipe for gas refrigerant (second connection pipe)
41...Flare union for liquid refrigerant 42...Flare union for gas refrigerant 51...Waterproof tube 61...Cylinder member 151...Heat exchange part 152...Heat transfer tube 311...First liquid refrigerant pipe (first refrigerant pipe and 1-1st refrigerant pipe) )
312...Second liquid refrigerant piping (second refrigerant piping and 2-1st refrigerant piping)
312a...First part 312b...Second part 312c...Third part 312d...Fourth part 312e...Fifth part 313...Connection part 321...First gas refrigerant pipe (first refrigerant pipe and 1-2nd refrigerant pipe)
322...Second gas refrigerant pipe (second refrigerant pipe and 2-2nd refrigerant pipe)
323…Connection part

Claims (8)

a casing (21);
a heat exchanger (15) housed in the casing (21);
Connecting pipes (31, 32) connected to the heat exchanger (15) and through which refrigerant flows;
Equipped with
The above connection piping (31, 32) is
a first refrigerant pipe (311, 321) connected to the heat exchanger (15) at one end and formed of a first metal;
a second refrigerant pipe (312, 322) formed of a second metal that is potentially nobler than the first metal of the first refrigerant pipe (311, 321);
Equipped with
One end of the second refrigerant pipe (312, 322) is connected to the other end of the first refrigerant pipe (311, 321) within the casing (21),
The second refrigerant pipe (312, 322) has a bent portion (312e) that is bent so as to project downward,
The bent portion (312e) is arranged within the casing (21) ,
In the top view of the casing (21), the bent portion (312e) of the indoor unit (1) is arranged at a position that does not overlap with electrical components in the casing (21). In the indoor unit (1) according to claim 1,
The other end of the first refrigerant pipe (311, 321) is an indoor unit (1) located above one end of the second refrigerant pipe (312, 322). In the indoor unit (1) according to claim 1 or 2,
A cylindrical member (61) that covers a part of the connection pipe (31, 32) but does not cover other parts of the connection pipe (31, 32),
In the other portion, one end of the second refrigerant pipe (312, 322) is connected to the other end of the first refrigerant pipe (311, 321) in the indoor unit (1). In the indoor unit (1) according to any one of claims 1 to 3,
The connection pipes (31, 32) include a first connection pipe (31) and a second connection pipe (32),
The first connection pipe (31) is
a 1-1 refrigerant pipe (311) connected to the heat exchanger (15) at one end and formed of the first metal;
It is formed of the second metal which is potentially nobler than the first metal of the 1-1 refrigerant pipe (311), and one end is connected to the other end of the 1-1 refrigerant pipe (311). A 2-1 refrigerant pipe (312) to be connected,
The second connection pipe (32) is
a 1-2 refrigerant pipe (321) connected to the heat exchanger (15) at one end and formed of the first metal ;
It is made of the second metal which is potentially nobler than the first metal of the 1st-2nd refrigerant pipe (321), and one end is connected to the other end of the 1st-2nd refrigerant pipe (321). An indoor unit (1) comprising a 2-2 refrigerant pipe (322) to be connected. In the indoor unit (1) according to claim 4 ,
The first connecting pipe (31) is a liquid pipe, while the second connecting pipe (32) is a gas pipe,
In the casing (2 1) , the other end of the 1-1 refrigerant pipe (311) is located above one end of the 2-2 refrigerant pipe (322) of the indoor unit (1). In the indoor unit (1) according to claim 5 ,
In the top view of the casing (21), the 1-1 refrigerant pipe (311) of the indoor unit (1) is arranged at a position that does not overlap with the 2-2 refrigerant pipe (322). In the indoor unit (1) according to any one of claims 1 to 3,
On the drain pan (29) provided in the casing (2 1) , one end of the second refrigerant pipe (312, 322) is connected to the other end of the first refrigerant pipe (311, 321), Indoor unit (1). An air conditioner comprising the indoor unit (1) according to any one of claims 1 to 7 .

that's all

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